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COMSPHERE 3550 Series Data Service Units
2-12 December 1996 3550-A2-GB20-20
Verifying DBM Operation
If a DBM is installed, test the tributary DBM for
dial tone, and verify that the DSU can place and receive
calls.
. Procedure
1.
Select
Bckup (F2).
2.
Select
Dial
to establish a dialed call to the
tributary.
(Refer to Chapter 4 for the procedure for entering
telephone numbers.)
3.
Select
!Dial to switch to the dial circuit.
4. Perform a Digital T
est following the DBM path
rather than the DSU path.
(No error message should appear.)
5.
Select
DrBU to drop the backup call.
6. Perform a Digital T
est on the DBM. Follow the
V
erifying the Network
procedure, selecting DBM
instead of DSU (Step 2).
Verifying TDM/Flex Operation
If a TDM/Flex is installed, perform a Digital T
est on
each port.
Other Tests
The
following lists the tests available on your DSU.
Refer to the T
est Branch
section of Chapter 4 for further
test information, as well as more detail on how to
configure and operate the DSU. Refer to Appendix A to
determine how best to access each test.
•
Device T
est (Devic)
•
Local Loopback
(LL)
•
DTE Loopback
(DTE)
• Digital Loopback (DL)
• Remote Digital Loopback (RL)
• Bilateral Loopback
• Digital T
est
(DT)
• End-to-End Test (EE)
•
Bit Err
or Rate T
est (BERT)
•
Lamp T
est (Lamp)